I'm way more in favor of anthologies because they're easier to part out, drop into homebrew settings, or use to populate hexcrawls or West Marches games. They can be as big or small as you need them and take as much time as you need them to. Need a one-shot, there you go. Players really want to continue to explore the ramifications of this part of the anthology, build it out. Whereas campaigns are multi-year investments with fairly fixed and linear storylines that are hard to maintain from without frequent railroading. To me, anthologies are simply more directly useful. I can and have parted out bits of campaigns, but it's easier to do when they're purpose built for the task.